Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.0147l&link_type=abstract
American Astronomical Society, HEAD meeting #9, #1.47; Bulletin of the American Astronomical Society, Vol. 38, p.336
Astronomy and Astrophysics
Astronomy
Scientific paper
Pulse shapes of accreting neutron stars contain information on both the emission region and the neutron star. Modeling pulse shapes can yield properties such as the position of the emission region, orientation of the observer and the star's mass and radius. To properly interpret observations of rapidly rotating X-ray pulsars, one requires theoretical models which account for general relativity, timing effects and stellar oblateness. We have developed a new computer code to calculate pulse shapes, which fully accounts for these effects, and obtain estimates on the accuracy of parameters obtained with a fitting method which uses a Schwarzschild approximation to the calculation of the light curve. Different levels of approximations to the full calculations, including time delays, Doppler effects, and stellar oblateness, have been developed. These have been applied to create fitting routines for modelling observed pulse shapes. As an example, results will be given for modelling the pulse shape of the accreting millisecond pulsar SAX J1808-3654.
Cadeau Coire
Leahy Denis A.
Morsink Sharon
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